EP0079262A1 - Verfahren zur Herstellung von Plattenkopien ausgehend von einer auf einer Matrize angeordneten Originalgravur - Google Patents

Verfahren zur Herstellung von Plattenkopien ausgehend von einer auf einer Matrize angeordneten Originalgravur Download PDF

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Publication number
EP0079262A1
EP0079262A1 EP82401952A EP82401952A EP0079262A1 EP 0079262 A1 EP0079262 A1 EP 0079262A1 EP 82401952 A EP82401952 A EP 82401952A EP 82401952 A EP82401952 A EP 82401952A EP 0079262 A1 EP0079262 A1 EP 0079262A1
Authority
EP
European Patent Office
Prior art keywords
substrate
substance
resin
matrix
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82401952A
Other languages
English (en)
French (fr)
Other versions
EP0079262B1 (de
Inventor
François Lange
Roger Rascle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0079262A1 publication Critical patent/EP0079262A1/de
Application granted granted Critical
Publication of EP0079262B1 publication Critical patent/EP0079262B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/68—Record carriers
    • G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/81—Sound record

Definitions

  • the invention relates to the production of video discs from an original matrix provided with a relief whose transfer by molding uses a resin.
  • the information is stored in the form of recessed or protruding surface accidents which along a track materialize the temporal variation of the signals carrying said information.
  • the molding processes are particularly well suited to the production of small series. They consist in placing an intermediate molding agent between a matrix and a substrate which, after solidification, provides a counter-type of the imprint carried by the matrix. This molding process introduces the concept of complementarity between the matrix and the disc since the hollows of one correspond to the reliefs of the other and vice versa.
  • the original disc carries successive tracks engraved for example by thermal ablation according to micro-cuvettes.
  • a copy disc is obtained, the surface of which, consisting of the layer of hardened molding agent, reproduces the same relief in negative, that is to say according to the chosen example of micro-reliefs.
  • a layer of a release agent between the original disc and the curable substance which may be detrimental locally to the quality of the micro-relief, or uses a resin that can spread easily and which, once hardened, does not adhere to the original disc, but which does adhere to the substrate which serves as its support.
  • One manufacturing method is to deposit the resin near the center of the matrix.
  • a flexible substrate is curved and applied to the resin then progressively flattened against the matrix in order to drive the resin towards the periphery of the substrate.
  • the resin is then polymerized for example using ultraviolet radiation.
  • the curve can be obtained using a system comprising a support ring supporting the substrate on its periphery and a deformable elastic cushion movable vertically allowing to exert a progressive thrust on the substrate, as described in the application for French patent number 7922300 filed by the plaintiff.
  • the resin covers the surface of the matrix and any excess resin forms a bead on the outer edge of the matrix.
  • the excess resin can flow back into the space formed between the centering nose of this device and the substrate. If these excess resin are polymerized, they can constitute attachment points which make demolding more difficult or which can damage the central bore of the substrate. On the other hand, all or part of the bead, of irregular shape, remaining attached to the substrate may prove harmful for the subsequent use of the disc.
  • the subject of the invention is therefore a process for obtaining a disc carrying information present in the form of surface micro-domains in an annular etching area, by molding from an original etched matrix, consisting in transferring on a substrate the imprint of the original disc by means of a substance spreading between said substrate and the original disc, said substance adhering to said substrate during its hardening, characterized in that the etching range extends between tracks interior and exterior blanks, the separation between the etching area and the blank areas being done by stop areas, and that the excess substance is contained by the stop areas.
  • FIG. 1 represents a phase of the production of a disc from a semi-rigid substrate, according to the known art.
  • This device comprises a cushion of cellular foam 4 placed in a seat 6 and formed for example of natural rubber or of elastomer in the axis of the central spindle and above the discs 1 and 7.
  • the cushion is designed to transmit a pressure on the substrate 7 in the writing area.
  • the entire seat and cushion is held above the disc 1 using a double-acting cylinder 5 which controls the descent of the cushion 4 along the axis zz '.
  • the crown 8 is retractable in a groove 9 formed in the plate 2, for example by means of a jack 12. When the cushion descends, it presses the substrate 7 in its center so as to crush the bead of resin 10.
  • the crown 8 then causes a curving of the substrate.
  • the cushion begins to deform from its central part by pushing the resin outwards.
  • the support ring 8 descends progressively, decreasing the curvature of the substrate until it is completely flattened in the plane of the matrix.
  • the face of the cushion in contact with the substrate has become flat and ensures pressure over the entire surface of the latter.
  • a central pressing ring 11 placed in a cavity of the cushion and urged by springs 13 is provided to exert a support at the center of the disc 7 and ensure in cooperation with the crown 8 the relative positions of the two discs throughout the duration of the phase spreading.
  • the ring 11 comes into operation from the start of the spreading phase and tends to push the resin outwards. At the end of this phase, a rest time is necessary in order to allow any excess resin to flow towards the outside of the matrix, in the groove 9.
  • a peripheral slot 14 is formed in the plate in the vicinity of the matrix and opens into a circular groove 15 where there is a slight overpressure, so as to drive the resin towards the groove 9 and to prevent it from entering the vacuum chamber 16 situated between the plate 2 and the disc 1.
  • the next phase consists in exposing the assembly supported by the plate 2 to the light supplied in an ultra-violet lamp.
  • a masking screen has been placed above this groove. After sunshine, the screen is removed and the support crown 8 rises under the action of the jack 12 so as to cause the separation of the substrate 7 on which the resin adheres.
  • Figure 2 is a top view of a copy disc according to the invention. On the substrate 7 of this disc, a distinction is made between the etching range 17 extending between inner 20 and outer 21 areas. The separation between the etching area and the areas 20 and 21 is made by stop areas 26 and 27.
  • Figure 3 is a sectional view of a disc according to the invention, in progress.
  • the original disc 1 and the substrate 7 have been kept.
  • the molding phases until the resin is flattened are the same as above. It can be seen that 2 circular grooves concentric with the axis zz 'of shallow depth 18 and 19 have been dug in the substrate 7. These grooves make it possible to collect the excess resin resulting from the flattening operation and therefore form stop ranges.
  • the copy disc After this operation and the resin hardening operation, this time done without a mask, the copy disc has an engraved area 17 delimited by the 2 concentric grooves 18 and 19 and two crowns 20 and 21 devoid of resin.
  • the presence of the groove 19 prevents excess resin close to the spindle 3 from filling the gap existing between this spindle and the substrate 7.
  • the grooves 18 and 19 by collecting the excess resin pushed towards the outer edge and towards the center of the substrate, contributes to creating crowns 20 and 21 which can receive seals allowing the fitting of a cover.
  • the width and depth required for the grooves depend on the amount of excess resin to be collected, i.e. on the precision of the metering of the deposited resin bead, uncontrolled variations in thickness of the resin layer , geometric qualities of the substrate and the matrix.
  • the width of the grooves can be between 1 and 3 mm and the depth between 0.1 and 0.3 mm. Too deep grooves would reduce the mechanical strength of the copy disc.
  • Figures 4 (a) and 4 (b) show two examples of possible profiles for the grooves. It is possible to have a rectangular section as shown in FIG. 4 (a) where a groove 22 is dug in the substrate 7, but it is preferable that the groove has a rounded shape such as the groove 23 dug in the substrate 7 and shown in Figure 4 (b). Indeed, this latter solution has the advantage of facilitating demolding and less affecting the mechanical strength of the substrate. It is advantageous to polish the surface of the groove in order to avoid disturbing the ultraviolet light flux serving, where appropriate, to polymerize the resin.
  • FIG. 5 is a sectional view of a disc in the process of being produced and having arrived at the same stage of manufacture as that illustrated in FIG. 3. It recognizes the pin 3 centered on the axis zz ', the substrate 7 and the matrix disk 1.
  • two circular and concentric grooves have been dug in the matrix to fulfill the same functions as above, that is to say to collect the excess resin.
  • the resin layer of the copy disc will end with 2 small beads whose maximum thickness corresponds to the depth of the grooves.
  • the grooves can have the same dimensions as when they are made on the substrate.
  • the shape of the grooves will preferably be rounded in order to facilitate demolding and it will be advantageous to polish it in order to avoid excessive adhesion of the bead of resin in the groove of the matrix during demolding.
  • Another way is to deposit on the area that the resin should not cover, on the disc or on the matrix, or on both at the same time, a layer of a material preventing the fixing of the resin on the substrate, by example a layer of silicone or polytetrafluoroethylene (better known by the initials PTFE).
  • a layer of a material preventing the fixing of the resin on the substrate by example a layer of silicone or polytetrafluoroethylene (better known by the initials PTFE).
  • a groove can optionally be provided to collect the excess resin.
  • the invention therefore makes it possible to have copy discs free of resin or of any other substance playing the same role on the areas where it is not desired. It allows copy discs to easily receive a cover. Above all, it avoids masking operations and the cleaning of excess resin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP82401952A 1981-11-06 1982-10-22 Verfahren zur Herstellung von Plattenkopien ausgehend von einer auf einer Matrize angeordneten Originalgravur Expired EP0079262B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8120854 1981-11-06
FR8120854A FR2516286A1 (fr) 1981-11-06 1981-11-06 Procede d'obtention d'un disque-copie a partir d'une gravure originale portee par une matrice

Publications (2)

Publication Number Publication Date
EP0079262A1 true EP0079262A1 (de) 1983-05-18
EP0079262B1 EP0079262B1 (de) 1985-08-21

Family

ID=9263771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401952A Expired EP0079262B1 (de) 1981-11-06 1982-10-22 Verfahren zur Herstellung von Plattenkopien ausgehend von einer auf einer Matrize angeordneten Originalgravur

Country Status (7)

Country Link
US (1) US4452748A (de)
EP (1) EP0079262B1 (de)
JP (1) JPS5884731A (de)
CA (1) CA1197006A (de)
DE (1) DE3265647D1 (de)
FR (1) FR2516286A1 (de)
HK (1) HK26990A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002935A1 (en) * 1985-11-18 1987-05-21 Eastman Kodak Company Process for making optical recording media

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6098125U (ja) * 1983-12-06 1985-07-04 パイオニア株式会社 情報記録円板
US5273598A (en) * 1985-02-18 1993-12-28 Hitachi Maxell, Ltd. Optical disc manufacturing method
JPS62105616A (ja) * 1985-11-01 1987-05-16 Daicel Chem Ind Ltd 光デイスクの射出成形用金型
JPS61148033A (ja) * 1985-12-06 1986-07-05 Hitachi Ltd デイスクの複製装置
JPS6334108A (ja) * 1986-07-30 1988-02-13 Hitachi Ltd 光デイスク用基板の製造方法および装置
US4961886A (en) * 1988-06-09 1990-10-09 Dow Corning Corporation Method of controlling flow by a radiation formed dam
NL9002517A (nl) * 1990-11-19 1992-06-16 Philips Nv Werkwijze voor het vervaardigen van een optisch uitleesbare plaat, alsmede inrichting voor de uitvoering van de werkwijze.
JP3207530B2 (ja) * 1992-06-30 2001-09-10 阿波エンジニアリング株式会社 光ディスクの製造方法
US5787068A (en) * 1996-11-07 1998-07-28 Imation Corp. Method and arrangement for preventing unauthorized duplication of optical discs using barriers
US20070275115A1 (en) * 2004-03-31 2007-11-29 Sumitomo Heavy Industries, Ltd. Mold For Molding Disk, Mirror-Surface Disk, And Molded Product

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2384404A1 (fr) * 1977-03-14 1978-10-13 Philips Nv Procede pour la realisation d'un porteur d'information en matiere synthetique presentant une structure stratifiee et dispositif pour la mise en oeuvre dudit procede
FR2463474A1 (fr) * 1979-08-10 1981-02-20 Philips Nv Procede et dispositif pour la realisation d'un porteur d'information en matiere synthetique
FR2468456A1 (fr) * 1979-09-06 1981-05-08 Thomson Csf Dispositif de moulage de disques porteurs d'informations

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346760A (en) * 1941-07-21 1944-04-18 Jackson O Kleber Wave record mold

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2384404A1 (fr) * 1977-03-14 1978-10-13 Philips Nv Procede pour la realisation d'un porteur d'information en matiere synthetique presentant une structure stratifiee et dispositif pour la mise en oeuvre dudit procede
FR2463474A1 (fr) * 1979-08-10 1981-02-20 Philips Nv Procede et dispositif pour la realisation d'un porteur d'information en matiere synthetique
FR2468456A1 (fr) * 1979-09-06 1981-05-08 Thomson Csf Dispositif de moulage de disques porteurs d'informations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002935A1 (en) * 1985-11-18 1987-05-21 Eastman Kodak Company Process for making optical recording media

Also Published As

Publication number Publication date
DE3265647D1 (en) 1985-09-26
JPH0428538B2 (de) 1992-05-14
FR2516286B1 (de) 1983-12-23
HK26990A (en) 1990-04-12
US4452748A (en) 1984-06-05
FR2516286A1 (fr) 1983-05-13
EP0079262B1 (de) 1985-08-21
CA1197006A (en) 1985-11-19
JPS5884731A (ja) 1983-05-20

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